For general miniature metric bearings, which with a bore diameter of 10 mm or less, or an outer diameter of less than 28 mm, can be called miniature metric bearings. Its main structure is mainly based on deep groove ball bearings and angular contact bearings. In ultra-small-aperture miniature bearings, they are generally divided into open bearings, shielded bearings and sealed bearings, with the difference between flange and non-flange. Moreover, the application of miniature metric bearings is also very extensive, and it can play a huge role in the requirements of high-speed rotation, low friction torque, low vibration, low noise, and the like.
The frictional torque of the miniature metric bearing is also the direct affection for the performance of the bearing and is a very important performance indicator. It also directly affects the loss of energy, and also the precision of precision instruments. If the frictional torque is too large, it will inevitably lead to an increase in the bearing temperature, which will directly aggravate the wear of the bearing and even damage the surface of the bearing. Therefore, for miniature metric bearings, the friction torque is also a factor that should be considered when selecting the bearing.
Such bearing structures and frictional moments also allow them to withstand the appropriate radial and thrust loads at low torques and provide high performance. The type and design of miniature metric bearings also meet the application requirements of almost all precision instruments. In industrial equipment, small motors, office equipment, micro-actuators, stepper motors, fans and transmission equipment, miniature metric bearings almost have their existence.